JPS59204001A - Plastic lens - Google Patents

Abstract

PURPOSE:To improve the accuracy in shape and the surface roughness by coating the surface of a cut plastic lens with an ultraviolet-curing resin. CONSTITUTION:A cut plastic lens 20 is softly mounted on a liq. ultraviolet curing resin 30 dropped on a liner 40, the lens 20 is pressed, and ultraviolet rays are irradiated from an irradiator 10. The ultraviolet rays cure the resin 30 through the lens 20 and bond it firmly to the surface of the lens 20. The lens 20 and the cured resin 30 coating the surface of the lens 20 are released from the liner 40. A plastic lens having a thin surface film of the resin 30 having fine surface roughness transferred correctly from the liner 40 is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has good shape accuracy <1. The invention also relates to an excellent plastic lens with low surface roughness.

In general, plastic lenses do not compensate for the disadvantages of glass lenses (heavy weight, multiple processing steps, etc.).1. ! This has been under consideration in various fields for quite some time.

)1! For aspherical lenses, their moldability is important.
Plus deck lens is necessary for Yu L; (lens □
Mari is definitely passing. 7 Conventionally, such plastic lenses have been manufactured using equipment such as No. 11-1.

That is, in Fig. 1ε, 1 is the stationary mold, 2 is the fixed mold,
A foot side insert, 3 a moving side insert having a shape corresponding to the fixed side insert 2, 4 a moving side mold having a shape to fit with the fixed side mold 1, 5
6 is a hydraulic cylinder (sometimes a toggle type) for fitting the movable side mold 4 to the fixed side mold 1, and 6 is a lens-shaped cylinder formed by the fixed side insert 2 and the movable side insert 3. a resin injection cylinder for injecting resin into the gap, and 7
is the injected resin.

In the conventional injection/compression molding apparatus having such a configuration, first, the fixed side insert 2 attached to the fixed side mold 1 is
and the moving-side insert 3 attached to the moving-side mold 4 are spaced apart from each other by a certain distance.

In this state, the resin 7 is injected from the resin injection cylinder 6 at high speed.
Injected at low pressure.

Next, hydraulic pressure is applied to the hydraulic cylinder 5, and at the same time the space between the fixed side insert 2 and the movable side insert 3 disappears,
The pressure is applied to compress the resin 7, and the resin 7 is molded into a lens-like shape formed by the stationary side insert 2 and the movable side insert 3.

Plus-17' by conventional injection/compression molding like this
,, / l-□ance (here, shape illj degree)
-, and +jlllj 'fli degree (to make the necessary Q, Z compression pressure white Q-: / l, ,
) I had to be a friend.

j-7 From C, increasing the compression pressure increases the residual stress in the lip and inside the molded resin. 1. It may become distorted or cause optical damage (l L
) There is a drawback that it is slow, but in the end, it is high i'? I've finished the 1st grade of Zonosu f-tsuku. No, I can't do that.

2) The L1 objective of the invention is 1, 2. Conventional plastic lens! , overcoming the drawbacks of , the surface of the J-machined plus 1,000 liters of 4M1 resin (2 liters of UV-cured 4M1 resin
-u-ink] 1-) Go, and 15. From the second point, the shape accuracy is 1.112mm, and the surface is 1.1112mm.
, :).

1. The present invention will be specifically explained with reference to the figures below.

The 21st Division 1 manufactures plastic lenses with 7 inventions:
f FIG. 5 is a sectional view of the device according to the fifth example.

On the 2121st 7] J, 10 is ultraviolet i, '+ curing resin, 1 person's ultraviolet irradiation device, 20 beam J
A machined plastic lens, 30 a liquid ultraviolet curing resin soaked along the surface (convex side in FIG. 2) of the plastic lens 20, 140 a nest that has been tightly cut and polished; and 50 is a mold body.

Next, a method for producing plastinoclens according to the present invention will be explained.

First, the plastic lens 20 before the ultraviolet curing resin 30 is coated with cola ink on the surface is
It is made by cutting with high precision using Hyde etc.

-(+2) According to the cutting process, some cutting stress remains near the 771 surface, but it is much smaller than the residual stress caused by conventional injection/compression molding.

Therefore, the shape accuracy of the lens is better achieved by beam cutting, and as a result, the optical performance of the lens is significantly improved.

Plasti cut in this way, Cleanse 2
0 is gently placed on top of the liquid ultraviolet curing resin 30 that has been dropped onto the insert 40 in advance and pressed.

Then, irradiate ultraviolet rays from the outer paper 1 irradiation device 10.
+Cure the fat 30.

, second rib, ultraviolet 1: ;if curing resin 30 is Plasti 7
The two surfaces C1 of C, 2/S 20 are firmly bonded.

After that, the plastic lens 20 (and the ultraviolet t4jjj curing (j; 1 fat 30
) from 40! 1j Kazuto, Hitoshi"40's delicate surface roughness 1j: 1. Kasho 6'f [transferred to +r, + fat 3
0 thin film on the surface, 7.1: Riirocho's)' last cleaning force is saved.

For example, the surface J'f1 degree of the plastic lens 20 that has been machined is 0.1-0.2 i [7'1 Enzo 3QQ, which is about 7'1];! t', the surface has a fine surface roughness of the insert 40: lr1'(r,;
:, te l;;L-2sa-U can be done. At this time,
The thickness of γt17I+9 of tree j finger) 0 may be 1 micron or more.

No. 1. 'Oh, in the above embodiment, the surface shape of the insert 40 is concave and L7 is 1. If you make this a flat surface, you can do the same with the front +-
In: We can also manufacture mirrors, prisms, etc. that have been significantly modified by +11 degrees.

For example, projection television screens are currently made by heating and press-molding polynotyl methacrylate plates with a surface thickness of 1'°.
This method takes too much time and the manufacturing cost per sheet is very high. Therefore, by coating a polynodyl methacrylate plate with an ultraviolet curing resin and irradiating it with ultraviolet rays, it is possible to improve the surface roughness, thereby reducing work time and costs. be.

If this is done as in the present invention, by coating the surface of polynotylnotacrylate with an ultraviolet curable resin, the curing time is short, so products with a high degree of 111J can be produced in a short time and at low cost. Moreover, since no pressure is applied, there is little chance of adverse effects on the optical droplets.

As explained above, according to the present invention, high-quality plasti and cleanses with good shape accuracy due to cutting and improved surface roughness due to the high-precision transferability of ultraviolet curable resin (jiffed), Obtained cheaply.

[Brief explanation of the drawing]

112I is a sectional view of a conventional apparatus for manufacturing a plastic lens, and FIG. 2 is a sectional view of an example of an apparatus for manufacturing a plastic lens of the present invention. DESCRIPTION OF SYMBOLS 10... Ultraviolet irradiation device, 20... Cutting plastic lens, 30... Ultraviolet curing resin, 40...
...Insert, 50...Mold body. 1t! I license applicant Pioneer Maki, Shikikai? , L agent Hideo Takino

Claims (1)

[Claims] A plastic lens characterized in that a thin film layer of ultraviolet curing resin is provided on the surface of a plastic lens that has been cut and is ζ.